By Tom Bowles Here’s our expert preview of the Ambetter 301 at New Hampshire Motor Speedway, along with fantasy driver picks, Vegas odds, start time, and TV channel as the NASCAR Cup Series returns to the Magic Mile. The NASCAR Cup Series playoff system is built to reward winning. Anyone inside the top 30 in points remains eligible to compete for a championship as long as they find their way to victory lane in Sunday’s Ambetter 301 at New Hampshire Motor Speedway. All it takes is one perfect weekend to erase a season’s worth of disappointing performances. Think it can’t be done? Just ask Stewa…